S08-013 - th The 14 World Conference on Earthquake...

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The 14 th World Conference on Earthquake Engineering October 12-17, 2008, Beijing, China KINETIC STRUCTURES IN ARCHITECTURE M.C. Phocas 1 and T. Sophocleous-Lemonari 2 1 Asst. Professor, Department of Architecture, Faculty of Engineering, University of Cyprus, Cyprus 2 Assoc. Lecturer, Design Department, University of Nicosia, Cyprus Email: mcphocas@ucy.ac.cy ABSTRACT : In the frame of integrated architectural design, the structural building design plays a most decisive role in supporting the areas of interdisciplinary development as regards form, construction and energy efficiency of the building. In earthquake endangered areas the design of the structure includes an additional level of complexity within the integral development, for achieving from an early design stage optimized characteristics in respect to the functional requirements and the dynamic behavior of the system. The capacity design approach that leads to the development of appropriate structural areas with energy dissipative characteristics, included in most national codes for earthquake safety, serves as the basis of the designs. In extending the “classical” structural design approach for earthquake resistance, the present paper examines innovative, alternative control methods for achieving dynamic adaptable structural systems. The control concepts rely on the integration of passive damping mechanisms within the structural systems. The analysis of kinetic structures presented herein addresses primarily configuration and dynamic behavior issues of the systems and aims at promoting within the integrated architectural design approach the development of adaptable earthquake resistant structures from an early design stage. The new control systems are based on a dual function of the damper-bracing components. The bracing mechanism has a kinetic closed circuit, working only in tension. Three different bracing configurations of a frame with plastic hysteretic devices are investigated in their dynamic behavior under actual earthquakes of the Greek-Mediterranean region. KEYWORDS: DUAL SYSTEMS, HYSTERETIC DAMPERS, PASSIVE CONTROL 1. INTRODUCTION In conventional seismic design, earthquake resistance is based on primary structural elements of the structure being able to absorb and dissipate energy in a stable manner for a large number of cycles. Earthquake inputs energy to specially detailed ductile plastic hinge regions of beams and column ends (capacity design). However this results in severe structural damage. The integration of damping devices into the structure with the main purpose of transforming them into mechanisms that can produce specified objective damping for avoiding damage of the primary structural elements provides a promising strategy. A number of researchers have investigated braced frame systems with integrated shear hysteretic dampers,
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S08-013 - th The 14 World Conference on Earthquake...

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